Issue with RS/6000 H50 from IBM Post: 302863113

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Operating Systems AIX Issue with RS/6000 H50 from IBM Post 302863113 by bakunin on Saturday 12th of October 2013 10:36:28 AM

10-12-2013

Registered User

Quote:

Originally Posted by ADS2459

Cheers bakunin
Your help is awesome.

*blushes* Thank you, you're welcome.

Quote:

Originally Posted by ADS2459

It is easier just to remove the SCSI drive, put another one in, and go for a fresh install of Linux?

Yes, you can do that. Be aware, though, that the integration of hardware and sofware is much higher than with PCs, which are regularly built out of a heap of nondescript components. Original IBM disks have a special firmware on board which makes them known to an AIX system instantly. Non-IBM disks show up there as "other SCSI disk", whereas IBM disks are recognized for size, queue depth, etc..

How much of this applies to Linux i don't know. I never ran Linux on that old systems. Just give it a try and if everything fails you can still put the original disks back into the case.

You might also have a look if the rootvg is mirrored. You could unmirror the rootvg then, this way freeing one of the installed disks and use this for the installation of Linux. Unlike PCs the firmware ("microcode" in IBM speak) maintains a "boot list" of devices to boot from. In fact there are 2 bootlists, one for the "service" and one for the "normal" key position. IBM systems had a key (not sure if the H50 has still one or if that device has gone virtual already on it) with 3 position: "locked", "service" and "normal". See the bosboot commands man page for more details about that. It is used to modify that bootlist and put boot sectors onto devices.

Caution: bosboot is an AIX command. If there is a similar command in PPC-Linux so that you can get back to have AIX booted i don't know.

To find out if the rootvg is mirrored (as root):

Code:

# lsvg -l rootvg

Shows a list of LVs in the rootvg. If the column for "physical partition" ("PP") shows the same number as for "logical partition" ("LP") the respective LV is not mirrored. If the number is twice (thrice) the number for "LP" it is mirrored (or doubly mirrored). If you have a mirrored rootvg you can use unmirrorvg to remove one of the mirrors and then reducevg to get the respective disk out of the rootvg.

I hope this helps.

bakunin

bakunin

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systemd-getty-generator

SYSTEMD-GETTY-GENERATOR(8)				      systemd-getty-generator					SYSTEMD-GETTY-GENERATOR(8)

NAME

       systemd-getty-generator - Generator for enabling getty instances on the console

SYNOPSIS

       /lib/systemd/system-generators/systemd-getty-generator

DESCRIPTION

       systemd-getty-generator is a generator that automatically instantiates serial-getty@.service on the kernel console(s), if they can function
       as ttys and are not provided by the virtual console subsystem. It will also instantiate serial-getty@.service instances for virtualizer
       consoles, if execution in a virtualized environment is detected. If execution in a container environment is detected, it will instead
       enable console-getty.service for /dev/console, and container-getty@.service instances for additional container pseudo TTYs as requested by
       the container manager (see Container Interface[1]). This should ensure that the user is shown a login prompt at the right place, regardless
       of which environment the system is started in. For example, it is sufficient to redirect the kernel console with a kernel command line
       argument such as console= to get both kernel messages and a getty prompt on a serial TTY. See kernel-parameters.txt[2] for more information
       on the console= kernel parameter.

       systemd-getty-generator implements systemd.generator(7).

       Further information about configuration of gettys can be found in systemd for Administrators, Part XVI: Gettys on Serial Consoles (and
       Elsewhere)[3].

SEE ALSO

       systemd(1), agetty(8)

NOTES

	1. Container
	       Interface
	   https://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/

	2. kernel-parameters.txt
	   https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt

	3. systemd for Administrators, Part XVI: Gettys on Serial Consoles (and Elsewhere)
	   http://0pointer.de/blog/projects/serial-console.html

systemd 237														SYSTEMD-GETTY-GENERATOR(8)